If a rock is thrown downward with an initial velocity of 8 feet per second, then its velocity 
, in feet per second, after 
seconds is given by
?
?
By how much does velocity increase over a 4-second period?
A. 32.16 feet per second
B. 128.09 feet per second
C. 32.00 feet per second
D. 128.00 feet per second
Answer: D
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Solve the problem.An object is thrown downward from a plane which is 600 m above the ground. The object is thrown with an initial velocity of 
How long does it take the object to reach the ground?
A. 7.57 seconds B. 8.35 seconds C. 14.67 seconds D. 19.35 seconds
Find the length of the curve.The spiral r = e4?, 0 ? ? ? ?
A. 
(?2 - 1)
B. 
(e8? - 1)
C. e8? - 
D. 
(e4? - 1)
Perform the indicated operation
Express the function as a trigonometric function of x.cos 4x
A. cos3x - 3 sin2x cos x B. 3 sin x - 4 sin3x C. cos4x - 6 sin2x cos2x + sin4x D. 4 sin x cos3x - 4 sin3x cos x